[Coffin, John Huntington Crane], 1815-1890. [from old catalog] · New York, D. Van Nostrand · leaf 250
* log sec i t and log cosec i t may be taken from Table XXVII. corre-sponding to t in the column P M (Art. 126). LATITUDE BY TWO ALTITUDES. 243 … angle q = P T Z < 90°, cos q is + ;and since, in (180), cos C and sin JIare -f, sin Z, and therefore Z, willalso be + . In the second case, whenM M produced passes between Pand Z, q = P Z Z > 90°, cos q and,consequently, sin Z and Z are —. Instead of marking Z + or —, wemay use the symbols N…
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